Terminal Resistor 120 Ohm, DB9, CAN Bus

Txhua lub koom haum CAN xav tau ob lub terminators; ib qho ntawm txhua qhov kawg ntawm lub network.

Lub CAN Terminator tuaj yeem siv tau qhov twg CAN cable lossis CAN node ntawm qhov kawg tsis muaj kev txiav tawm sab hauv.

Vim li cas thiaj xaiv 120Ω resistor?

Dab tsi yog impedance? Hauv hluav taws xob, qhov tsis kam rau qhov tam sim no hauv Circuit Court feem ntau hu ua impedance. Chav tsev ntawm impedance yog ohm, uas feem ntau yog qhia raws li Z, uas yog tus lej Z= R ntxiv rau i(ωL–1/(ωC)). Tshwj xeeb, impedance tuaj yeem muab faib ua ob ntu, qhov tsis kam (qhov tiag) thiab reactance (xav txog ib feem). Cov reactance suav nrog capacitive reactance thiab inductive reactance. Qhov kev cuam tshuam tam sim no los ntawm capacitance yog hu ua capacitive reactance, thiab tam sim no kev cuam tshuam los ntawm inductance yog hu ua inductive reactance. Impedance ntawm no yog hais txog hom Z.

Cov yam ntxwv impedance ntawm ib qho cable tuaj yeem tau txais kev sim. Ib qho kawg ntawm lub cable txuas nrog lub tshuab hluav taws xob square yoj, lwm qhov kawg yog txuas nrog qhov hloov kho tau, thiab lub waveform ntawm tus resistor yog pom los ntawm oscilloscope. Kho tus nqi ntawm cov resistor kom txog rau thaum lub teeb liab ntawm lub resistor yog ib tug zoo square yoj yam tsis muaj ringing, thiab tus nqi kuj nyob rau lub sij hawm no yuav suav hais tias yuav tsum tau raws li cov yam ntxwv impedance ntawm lub cable.

Siv ob txoj kab hluav taws xob siv hauv tsheb thiab sib tw rau hauv kev sib tw, cov yam ntxwv impedance tuaj yeem tau txais raws li cov qauv saum toj no, uas yog hais txog 120Ω, uas kuj yog tus nqi tsis kam ntawm lub davhlau ya nyob twg los ntawm CAN tus qauv, yog li qhov no 120Ω yog ntsuas. Nws tsis suav nrog, nws yog xam raws li cov yam ntxwv ntawm cov hlua hluav taws xob. Tau kawg, nws kuj tau txhais hauv ISO 11898-2 tus qauv.

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